It is fairly easy to keep track of how much one smokes by counting how many were consumed in a day, but this doesn't seem to be so simple with the ecigs. For example, if I have seven different flavors, I could vape to excess without emptying a cartridge. Conversely, I could empty a lot of cartridges whilst vaping only a little if they were all nearly empty to begin with.
When switching to a lower mg/mL liquid, how does a person check to make sure they actually stepping their daily nicotine intake down?

